19. Which compound would show major fragment ions at m/z 73 and 59? (A) OH CH3CH2CHCH2CH3 OH (B) CH3CH2CH2CHCH3 OH (C) CH3CHCHCH3 CH3 (D) OH CH3CCH2CH3 CH3
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- In 1H and 13C NMR spectra, how many signals does the unsaturated ketone (CH3)2CHCH2C (O)CH=CH2 have? Choices: 6H-6C, 5H-6C, 5H-7C, 6H-7CHN 1. a) Assign R/S to all stereogenic centers and circle all diastereotopic protons b) Draw the ¹H NMR spectrum of the depicted compound c) How many signals will appear in the 13C NMR spectrum15) What compound is produced when N,N-dimethylpropanamide (shown below) is treated with LiAlH4? A) CH3CH2CONH2 B) CH3CH2CH2NH2 C) CH3CH2CH2OH D) CH3CH2CH2N(CH3)2 E) CH3CH2N(CH3)2
- Which ppm value on the 1H NMR of vanillin corresponds to the methoxy group? 3.96 ppm (singlet, 3H) 6.30 ppm (singlet, 1H) 7.04 ppm (doublet, 1H) 7.43-7.41 ppm (multiplet, 2H) 9.82 ppm (broad, singlet, 1H)Your answer is incorrect. NH2 O (15,3S)-3-isopropylcyclohexanamine O (1R,3R)-3-isopropylcyclohexanamine (1R,3S)-3-isopropylcyclohexanamine ○ (15,3R)-3-isopropylcyclohexanamine = SUPPORPQ-4. Predict the major product(s). (A) I Br (B) II Nal acetone Q I (C) III II (D) I and II III
- Choose the reagent(s) that will accomplish the following transformation: - OH Na2Cr₂O7, H₂SO4 1) CH3MgBr (2 eq), 2) H3O+ 1) LIAIH4, 2) H3O+, 3) CH3MgBr (2 eq), 4) H3O+ 1) LIAIH4, 2) H3O+ 1) TSCI, 2) NaOHWhat is the structure of the compound with the formula C10H14O, which shows a strong broad signal near 3300 cm-1, the 1H-NMR spectrum is: 1.44 ppm (9H singlet) 4.97 ppm (2H doublet) 7.32 ppm (2H doublet)Which of the following compounds displays two triplets and a singlet in its 'H NMR spectrum? O CH3OCH2CH2CH2CH20CH3 O CH30CH2CH(OH)CH3 O CH3CH(OCH3)2 O CH3OCH2CH2OCH3 O CH3CH20CH2CH3
- PQ-28. What is the major product of this reaction? (A) (C) ОН ОН H3CH₂ CH₂CH3 (B) (D) 1) CH3CH₂MgBr 2) NHA HO CH₂CH3 ОНFor each of the following pairs, predict which substance is more soluble in water. (d) CH3CH2CN or CH3CH2OCH3 (e) CH3CH2OH or CH3CH2CH2OH (f) CH3CH2OCH3 or CH3CH2CO2HCompound X (molecular formula C10H12O) was treated with NH2NH2, -OH to yield compound Y (molecular formula C10H14). Based on the 1H NMR spectra of X and Y given below, what are the structures of X and Y?